2017 NFL Free Agency: Star rating is out of five. Age listing as of Sept. 1, 2017.
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Nick Mangold, C, Jets. Age: 33.
Nick Mangold was once the best center in the NFL. He's been injured quite a bit the past two years, so he can no longer maintain that status. However, when healthy, Mangold is still a terrific player. He's 33 now, but interior linemen have been able to play at a high level until their mid-to-late 30s.
J.C. Tretter, C/G, Packers. Age: 26. Signed with Browns (3 years, $16.75 million)
J.C. Tretter began the year as Green Bay's starting center, but lost his job when suffering a sprained MCL. It's a shame for Tretter because he had been performing on a high level, especially in pass protection. The other center, Corey Linsley, has just been better.
Joe Hawley, C, Buccaneers. Age: 27. Re-signed with Buccaneers (2 years)
Joe Hawley had a rocky start to his career in Atlanta, but has since improved. He was solid for the Buccaneers this past season, though slightly toward the end of the year, perhaps because of a knee injury he suffered in Week 9.
John Sullivan, C, Redskins. Age: 32. Signed with Rams
John Sullivan was once a very skilled center for the Vikings. I don't know why he was a backup this past year, but Sullivan should be someone's starting center. He turns 32 in August, but interior blockers can perform on a high level well into their mid-30s.
Stefen Wisniewski, C/G, Eagles. Age: 28. Re-signed with Eagles (3 years, $9 million)
Stefen Wisniewski has been a very good backup for the Eagles, as he performed very well when asked this past season. Wisniewski is too good to remain a reserve, as he can be a somewhat decent starter at guard or center for someone else.
A.Q. Shipley is a late bloomer, finally developing into a solid center this past season after bouncing around the league for a while. Unfortunately for Shipley, he turns 31 in May, but could still play well for a while.
Jeremy Zuttah, C, 49ers. Age: 31. Signed with Ravens
The 49ers cutting Jeremy Zuttah is confusing. He made the Pro Bowl last year and played fairly well. However, the Ravens traded him, and then the 49ers released him. Something is going on, but Zuttah might still be a nice addition for a team needing a center. Possible destinations for Zuttah include the Packers, Dolphins (both need a backup), Vikings, Jets and Chargers (Matt Slauson could move to guard).
Ryan Groy (RFA), C, Bills. Age: 27. Re-signed with Bills (2 years, $5 million)
The Bills lost Eric Wood for the year, but Ryan Groy did a solid job as a replacement.
Ted Larsen, C/G, Bears. Age: 30. -- Signed with Dolphins
Tim Barnes, C, Rams. Age: 29. -- Signed with 49ers
Eric Kush, C, Bears. Age: 27. -- Re-signed with Bears
Jonotthan Harrison (RFA), C/G, Colts. Age: 26.
Brian Schwenke, C/G, Titans. Age: 26. -- Signed with Colts
Cody Wallace, C, Steelers. Age: 32.
Anthony Steen (RFA), C, Dolphins. Age: 27.
T.J. Johnson (RFA), C, Bengals. Age: 27. -- Re-signed with Bengals (2 years)